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One hundred math problems in the first day of junior high school
Let the number of the result be x.

Then the first number is x+4.

The second number x-4

The third number x/4

The fourth number 4x

x+4+x-4+4x+x/4= 100

6x+x/4= 100

25x=400

x= 16

The first number 12, the second number 20, the third number 4 and the fourth number 64.

The result number refers to the number that is still the same when four numbers are calculated according to their respective conditions. That is, the number with the same result in your topic.